Girish Mahajan

Enneagrammic prism

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Type  Uniform polyhedron
Edges  27
Vertex configuration  /2.4.4
Faces  2 enneagrams 9 squares
Vertices  18
Wythoff symbol  2 9/2 | 2
Enneagrammic prism

In geometry, the enneagrammic prism is a nonconvex prisms formed by squares sides and two regular star polygon caps. There are two forms based on the two types of enneagrams: {9/2} and {9/4}.

References

Enneagrammic prism Wikipedia